Question

How can this be achieved in SQL (MS SQL)

Thanks

OK: let me bit clear what am trying to acheive is generating dynamic select statement with EXCEPT clause.

eg: select col1,col2,col3 from @table
except
select col1,col2,col2 from @table

so my resultset will be always different based on @table

futher down i want to use this @table in CTE

with filteredData
as
(
select col1, col2 from temptable –(created above)
)

below is the code so far:

    DECLARE @TABLENAME VARCHAR(200) = 'SERVICE_DELIVERY_LOCATION';
DECLARE @COLCOUNT INT ;
DECLARE @TEMPCOLNAME VARCHAR(500) ;
DECLARE @SELECTCOLUMNS VARCHAR(5000)='';
DECLARE @EXCEPTSTATEMENT VARCHAR(5000)='' ;

---------------------------------------------------------------------------------------------------
--CASE: GET COMMON_COLUMNS COLUMNS OF SOURCE AND DESTINATION TABLE
---------------------------------------------------------------------------------------------------
DECLARE @COMMON_COLUMNS TABLE( COLUMN_NAME VARCHAR(500))
INSERT  INTO @COMMON_COLUMNS 
    SELECT  SOURCE.COLUMN_NAME FROM   SCD_SOURCE.INFORMATION_SCHEMA.COLUMNS SOURCE
    INNER JOIN SCD_DESTI.INFORMATION_SCHEMA.COLUMNS DESTI ON SOURCE.COLUMN_NAME = DESTI.COLUMN_NAME


---------------------------------------------------------------------------------------------------
--CASE: GET PK COLUMNS OF SOURCE TO MAP TO DESTINATION IN CASE WHERE NEED TO DO UPDATES
---------------------------------------------------------------------------------------------------
DECLARE @PK_COLUMNS TABLE ( PK_COLUMN VARCHAR(500))
INSERT INTO @PK_COLUMNS
    SELECT KCU.COLUMN_NAME
    FROM    SCD_SOURCE.INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS TC  
    JOIN    SCD_SOURCE.INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS KCU ON KCU.CONSTRAINT_SCHEMA = TC.CONSTRAINT_SCHEMA  
        AND KCU.CONSTRAINT_NAME = TC.CONSTRAINT_NAME  
        AND KCU.TABLE_SCHEMA = TC.TABLE_SCHEMA  
        AND KCU.TABLE_NAME = TC.TABLE_NAME 
        AND KCU.COLUMN_NAME !=  'CREATE_DATA_CONTAINER_ID'
    WHERE TC.CONSTRAINT_TYPE IN ('PRIMARY KEY') 


SELECT  @COLCOUNT = COUNT(*) FROM @COMMON_COLUMNS

WHILE ( @COLCOUNT != 0 )
    BEGIN
        SET @TEMPCOLNAME = (SELECT TOP 1 COLUMN_NAME FROM @COMMON_COLUMNS)
        SET @SELECTCOLUMNS = @SELECTCOLUMNS + @TEMPCOLNAME + ', '
        DELETE FROM @COMMON_COLUMNS WHERE COLUMN_NAME = @TEMPCOLNAME
        SELECT  @COLCOUNT = COUNT(*) FROM @COMMON_COLUMNS
    END

SET @SELECTCOLUMNS = SUBSTRING(@SELECTCOLUMNS, 1, LEN(@SELECTCOLUMNS) - 1)

SET @EXCEPTSTATEMENT = 'SELECT ' + @SELECTCOLUMNS + ' FROM SCD_SOURCE.DBO.' + @TABLENAME + ' EXCEPT SELECT ' + @SELECTCOLUMNS + ' FROM SCD_DESTI.DBO.' + @TABLENAME
EXEC(@EXCEPTSTATEMENT)

want the resultset of last line into temptable

thanks

Answer 1

I’ve used this answer / script before.